Hi!
Let me see, if it is only postproduction…
Traking image, 3d , compo.. making efects.. some color correction..
Those arent difficult.. you saw then everywhere..
All of those, you can get a scene for a 8 hours day.
If you need to add some specific 3d model , lets say that the Macdonals Space shuttle.. that one is easy .. but you have to add some time for making that model, extra 2 hours for that.
And thats it.
Felix